| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 20,865 | 25,284 | 46,897 | |
| 2020 | R | 22,196 | 23,853 | 47,067 | |
| 2016 | R | 18,102 | 21,130 | 41,933 | |
| 2012 | D | 21,454 | 16,294 | 38,457 | |
| 2008 | D | 23,715 | 17,452 | 41,951 | |
| 2004 | D | 21,062 | 18,360 | 40,294 | |
| 2000 | D | 19,822 | 13,786 | 36,268 | |
| 1996 | D | 18,200 | 10,925 | 35,221 | |
| 1992 | D | 16,194 | 12,315 | 40,037 | |
| 1988 | R | 16,486 | 17,532 | 34,451 | |
| 1984 | R | 12,660 | 20,552 | 33,367 | |
| 1980 | R | 12,703 | 15,527 | 32,489 | |
| 1976 | D | 16,731 | 14,579 | 31,506 | |
| 1972 | R | 13,478 | 17,852 | 31,740 | |
| 1968 | D | 15,641 | 11,680 | 28,502 | |
| 1964 | D | 20,657 | 7,490 | 28,163 | |
| 1960 | D | 16,410 | 12,488 | 28,898 | |
| 1956 | R | 11,057 | 16,385 | 27,441 | |
| 1952 | R | 12,668 | 14,694 | 27,423 | |
| 1948 | D | 12,559 | 11,167 | 23,998 | |
| 1944 | D | 12,123 | 9,816 | 22,025 | |
| 1940 | D | 12,195 | 9,841 | 22,071 | |
| 1936 | D | 10,268 | 9,327 | 20,290 | |
| 1932 | D | 8,776 | 7,770 | 16,721 | |
| 1928 | R | 7,668 | 8,200 | 15,924 | |
| 1924 | R | 4,434 | 7,724 | 12,936 | |
| 1920 | R | 4,120 | 7,008 | 11,303 | |
| 1916 | R | 3,101 | 3,471 | 6,702 | |
| 1912 | R | 2,361 | 2,483 | 5,961 | |
| 1908 | R | 2,152 | 4,043 | 6,375 | |
| 1904 | R | 2,324 | 4,027 | 6,526 | |
| 1900 | R | 2,104 | 4,033 | 6,225 | |
| 1896 | R | 873 | 2,949 | 4,191 | |
| 1892 | — | — | — | — | |
| 1888 | R | 2,611 | 3,415 | 6,263 | |
| 1884 | R | 2,251 | 3,366 | 5,617 | |
| 1880 | R | 2,305 | 3,601 | 5,907 | |
| 1876 | R | 2,266 | 3,377 | 5,643 |
Northeastern Connecticut Planning Region in New England has, for decades, voted very close to the way the country has voted. Its margins are typically narrow, and the candidate who carries Northeastern Connecticut Planning Region more often than not also wins the national popular vote.
The Democratic margin in Northeastern Connecticut Planning Region has rarely exceeded forty-seven points in modern history; the Republican margin has rarely exceeded fifty points. 2024 delivered the county to the Republican candidate by nine points.
Northeastern Connecticut Planning Region's demographics resemble the country more than they resemble most counties. A 87% non-Hispanic-white share, a 8% poverty rate, and a median household income of $90,589 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Androscoggin County and St. Lawrence County.
